1285249672 has 16 divisors (see below), whose sum is σ = 2754106560. Its totient is φ = 550821264.

The previous prime is 1285249663. The next prime is 1285249681. The reversal of 1285249672 is 2769425821.

It is an interprime number because it is at equal distance from previous prime (1285249663) and next prime (1285249681).

It is a super-2 number, since 2×1285249672² = 3303733438752215168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11475388 + ... + 11475499.

It is an arithmetic number, because the mean of its divisors is an integer number (172131660).

Almost surely, 2^1285249672 is an apocalyptic number.

It is an amenable number.

1285249672 is an abundant number, since it is smaller than the sum of its proper divisors (1468856888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1285249672 is a wasteful number, since it uses less digits than its factorization.

1285249672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22950900 (or 22950896 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 1285249672 is about 35850.3789659189. The cubic root of 1285249672 is about 1087.2493763765.

The spelling of 1285249672 in words is "one billion, two hundred eighty-five million, two hundred forty-nine thousand, six hundred seventy-two".